import Vue from 'vue'
import VueRouter from 'vue-router'

Vue.use(VueRouter)

const router = new VueRouter({
  routes: [
    {
      path: '/',
      redirect: '/login'
    },
    {
      path: '/login',
      component: () => import('../components/Login')
    },
    {
      path: '/home',
      component: () => import('../components/Home'),
      redirect: '/welcome',
      children: [
        {
          path: '/welcome',
          component: () => import('../components/Welcome')
        },
        {
          path: '/users',
          component: () => import('../components/user/Users')
        }
      ]
    }
  ]
})

// 挂载路由导航守卫
router.beforeEach((to, from, next) => {
  // to 代表将要访问的路径
  // from代表从哪个路径跳转而来
  // next是一个函数，代表放行
  // next()放行  next('/login') 强制跳转
  if (to.path === '/login') return next()
  // 获取token
  const tokenStr = window.sessionStorage.getItem('token')
  if (!tokenStr) return next('/login')
  next()
})

export default router
